Hobson, E.W. <br/><br/>
A treatise on plane trigonometry 
/E.w.Hobson 
 - 5th ed. 
 - Cambridge  Cambridge university press  1921 
 - xiv, 383 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Analytic trigonometry<br/> Plane trigonometry
<br/><br/><label>Dewey Class. No.: </label>516.34  / HOB